In light of OpenX and SteelHouse's recent announcements that they had both exceeded $130 million in revenue in 2015, we decided to put together a short list of LA ad tech companies you should know. From industry mainstays to up-and-comers, here are 10 startups changing the digital ad space.

In the last 15 years, several high-profile businesses were acquired for large sums of cash, allowing dozens of now-experienced professionals to move on to new organizations — many of which are local — or even start new ventures of their own.